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IRISSAK [1]
3 years ago
9

Find a unit vector u in the same direction as v= (8,-4)

Mathematics
1 answer:
polet [3.4K]3 years ago
6 0
<h2>Explanation:</h2>

In this exercise we have the following vector:

\vec{v}=(8,-4)

So we need to find a unit vector \vec{u} which is defined as follows:

\vec{u}=\frac{\vec{v}}{\mid \vec{v} \mid}

Finding the magnitude of the vector:

\mid \vec{v} \mid=\sqrt{(8)^2+(-4)^2} \\ \\ \mid \vec{v} \mid=\sqrt{64+16} \\ \\ \mid \vec{v} \mid=\sqrt{80} \\ \\ \mid \vec{v} \mid=4\sqrt{5}

Then, by substituting the unit vector is:

\vec{u}=\frac{(8,-4)}{4\sqrt{5}} \\ \\ \vec{u}=\frac{(8,-4)}{4\sqrt{5}} \\ \\ \vec{u}=(\frac{8}{4\sqrt{5}},-\frac{4}{4\sqrt{5}}) \\ \\

\vec{u}=(\frac{8}{4\sqrt{5}}\frac{\sqrt{5}}{\sqrt{5}},-\frac{4}{4\sqrt{5}}\frac{\sqrt{5}}{\sqrt{5}}) \\ \\ \\ \boxed{\vec{u}=\left(\frac{2\sqrt{5}}{5},-\frac{5}{\sqrt{5}}\right)}

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